Altitude; Airflow And Heat Dissipation; Temperature And Humidity Requirements For Storage Expansion Enclosure In A Typical Information Technology (It) Or Office Environment; Temperature And Humidity Requirements For Storage Expansion Enclosure In A Nebs/Etsi Compliant Environment - IBM DS3950 User And Installation Manual

Table 9. Temperature and humidity requirements for storage expansion enclosure in a typical
Information Technology (IT) or office environment
Condition
Temperature
Relative humidity (no
condensation)
Table 10. Temperature and humidity requirements for storage expansion enclosure in a
NEBS/ETSI compliant environment
Condition
1
Temperature
1
Relative humidity (no
condensation)
Notes:
1. In a NEBS/ETSI compliant environment, conditions are measured at a location 1.5 m (59
in.) above the floor and 400 mm (15.8 in.) in front of the equipment.
2. Short-term refers to a period of not more than 96 consecutive hours and a total of not
more than 15 days in one year. (This refers to a total of 360 hours in any given year, but
no more than 15 occurrences during that one-year period.)

Altitude

Table 11 lists the acceptable altitudes for operating, storing, and shipping the
EXP395.
Table 11. EXP395 altitude ranges
Environment
Operating
Storage
Transit

Airflow and heat dissipation

Figure 7 on page 16 shows the intended airflow for the EXP395. Allow at least 30
inches in front of the storage subsystem and at least 24 inches behind the storage
subsystem for service clearance, proper ventilation, and heat dissipation.
Parameter
Operating range
Maximum rate of change
Operating range
Parameter
Operating range
2
Short-term
Maximum rate of change
Operating range
2
Short-term
Altitude
30.5 m (100 ft.) below sea level to 3000 m
(9842 ft.) above sea level
30.5 m (100 ft.) below sea level to 3000 m
(9842 ft.) above sea level
30.5 m (100 ft.) below sea level to 12,000 m
(40,000 ft.) above sea level
Requirement
10° - 35° C (50° - 95° F)
10° C (18° F) per hour
8% to 80%
Requirement
5° - 40° C (41° - 104° F)
-5° - 50° C (23° - 122° F)
30° C (54° F) per hour
5% to 85%
5% to 90% (not to exceed
0.024 kg water/kg of dry air)
Chapter 1. Introduction
15